A severe pain in the upper abdomen often makes people think of acidity, gas or gallstones. But in rare—and potentially life-threatening—situations, the pain may be coming from the heart.
The message you should remember
Not every chest pain is caused by the heart—and not every “stomach pain” begins in the stomach. New or severe upper abdominal pain accompanied by chest discomfort, sweating, breathlessness, nausea, dizziness or pain spreading to the arm, back, neck or jaw needs emergency medical attention.
A Patient Came With “Stomach Pain”—The ECG Told a Different Story
A patient arrived with severe pain in the upper part of the abdomen. At first glance, this could easily have been mistaken for a digestive problem. Upper abdominal pain is commonly associated with acidity, gastritis, gallstones, ulcers or pancreatitis.
However, this patient also mentioned mild chest discomfort and pain in the left arm. These symptoms may have appeared less intense than the abdominal pain, but they were extremely important clues. Instead of assuming that the problem was only acidity or gallstones, the possibility of a heart-related emergency was considered.
An ECG was performed immediately. The tracing showed changes suggestive of a heart attack, and further evaluation revealed a blockage in a coronary artery. The patient could then be directed towards urgent cardiac treatment without losing valuable time.
This case highlights a common danger: people often focus only on the place where the pain feels strongest. If the upper abdominal pain is severe, they may describe it simply as “gastric pain” and overlook milder symptoms elsewhere. But in an emergency, the combination of symptoms can be more important than any single symptom. Mild chest discomfort, arm pain, sweating or nausea alongside upper abdominal pain should never be dismissed.
Because the warning signs were recognised and treatment was started without delay, the patient’s life could be saved. Had the patient continued taking antacids at home or waited for the pain to settle, the outcome could have been very different.
Sometimes, the smallest accompanying symptom—a mild chest sensation, unusual sweating or pain in an arm—may be the clue that prevents a dangerous delay.
Can Stomach Pain Really Be a Sign of a Heart Attack?
Yes. A heart attack does not always produce the dramatic central chest pain people expect. Pain or discomfort may sometimes be felt in the upper abdomen or epigastric region—the area just below the breastbone. Some people describe it as pressure, heaviness, burning, indigestion, gas, nausea or a “strange stomach pain.”
The heart, chest and upper abdomen have overlapping nerve pathways. Because of this, the brain may not always identify the exact organ causing the pain. This is known as referred pain. Heart-related discomfort can therefore be felt in the upper abdomen, shoulders, arms, back, neck or jaw.
The American Heart Association includes stomach discomfort, shortness of breath, cold sweat, nausea and lightheadedness among possible heart-attack warning signs. The Mayo Clinic also notes that pain can spread to the upper belly and may feel like heartburn or indigestion.
Why Can a Heart Problem Cause Pain Below the Chest?
The heart is located in the chest, but pain is not always felt exactly over the organ causing it. Nerves carry signals from the heart and nearby areas to the spinal cord, where they may travel through shared pathways. The brain can sometimes interpret these signals as coming from another part of the upper body. This is why heart-related discomfort may be felt in the upper abdomen, either arm, the shoulders, back, neck or jaw.
The lower surface of the heart also lies close to the diaphragm, the muscular structure separating the chest from the abdomen. When this area of the heart is affected, some patients may experience nausea, vomiting, indigestion-like discomfort or pain near the upper stomach. The sensation may be burning, pressure, fullness or heaviness rather than a sharp pain.
Importantly, there is no single “correct” way for a heart attack to feel. Some attacks begin suddenly and intensely, while others start gradually with mild or intermittent discomfort. The symptoms may improve temporarily and return. A temporary reduction in pain does not prove that the danger has passed.
Why Is It So Easily Mistaken for Acidity or Gallstones?
The symptoms can look very similar
Acidity may cause burning behind the breastbone or in the upper abdomen. Gallstones may cause strong upper-abdominal pain, often toward the right side, sometimes with nausea or vomiting. Heart-related pain may also feel like burning, pressure, heaviness or indigestion.
That is why symptoms alone cannot always provide a safe diagnosis. Antacids, home remedies or waiting for the pain to settle can be dangerous if the real cause is cardiac.
If the pain is new, severe, unexplained or accompanied by warning signs, seek urgent medical evaluation.
| Feature | May suggest a digestive cause | Needs urgent assessment for a heart cause |
|---|---|---|
| Feeling | Burning, bloating, sour taste or discomfort related to food | Pressure, tightness, heaviness, squeezing—or unusual indigestion |
| Location | Upper middle or right abdomen | Upper abdomen with chest, arm, back, neck or jaw discomfort |
| Associated signs | Belching, reflux or symptoms after a particular meal | Cold sweat, breathlessness, nausea, dizziness, faintness or unusual weakness |
| What to do | Persistent or recurring symptoms still need medical review | Seek emergency medical care immediately |
Red Flags: When Upper Abdominal Pain Is an Emergency
Look beyond the stomach
Do not wait at home if sudden, severe or unexplained upper abdominal pain occurs together with symptoms elsewhere in the body.
Cold sweating, breathlessness, dizziness, nausea or discomfort spreading to an arm, the back, neck or jaw may indicate a medical emergency.
Even mild chest or arm discomfort can be an important clue when the abdominal pain is severe.
- Chest pressure, tightness, heaviness, burning or discomfort
- Pain spreading to the left or right arm, shoulder, back, neck or jaw
- Cold sweat or clammy skin
- Shortness of breath
- Nausea or vomiting that feels unusual or intense
- Dizziness, lightheadedness, fainting or sudden weakness
- A rapid, irregular or unusually forceful heartbeat
- Symptoms triggered by walking, climbing stairs or physical effort
- Pain that persists, returns, worsens or simply feels different from your usual acidity
When in doubt, treat it as an emergency
Call your local emergency medical service. Do not delay care to try antacids or home remedies, and do not drive yourself if an ambulance or another safe option is available. Heart muscle damage can increase with every minute that treatment is delayed.
What Should You Do in the First Few Minutes?
- Stop physical activity. Sit or lie down safely and avoid walking around unnecessarily.
- Call emergency medical services. Clearly describe the upper abdominal pain and every associated symptom, including even mild chest, arm, jaw or back discomfort.
- Note when the symptoms began. The medical team may ask about the exact or approximate onset time because treatment decisions can be time-sensitive.
- Keep medical information ready. If possible, have the person’s medication list, known allergies, diabetes or blood-pressure history and previous heart reports available.
- Do not leave the person alone. Watch for worsening breathlessness, fainting, confusion or unresponsiveness while help is on the way.
If the person becomes unresponsive and is not breathing normally, the emergency operator can guide a bystander through cardiopulmonary resuscitation (CPR) and the use of an automated external defibrillator (AED), if one is available.
What Should You Avoid Doing?
- Do not assume the pain is “only gas” because the person has experienced acidity before.
- Do not spend valuable time repeatedly trying antacids, hot water or home remedies when emergency warning signs are present.
- Do not ask the person to walk, climb stairs or “see whether the pain increases.”
- Do not let the person drive alone to the hospital.
- Do not give food, drinks or medicines unless advised by a qualified medical professional or emergency service.
- Do not wait for severe chest pain to appear. A heart attack can occur with mild chest discomfort or without obvious chest pain.
Who May Have Less Typical Heart-Attack Symptoms?
Anyone can have an atypical presentation, but less obvious symptoms are especially important to recognise in:
- Women
- Older adults
- People living with diabetes
- People with high blood pressure or high cholesterol
- Smokers
- People who are overweight or have known heart disease
In some people, chest pain may be mild or absent. Breathlessness, nausea, upper abdominal discomfort, back or jaw pain, unusual fatigue, sweating or dizziness may be more noticeable. This is one reason it is unsafe to wait for “classic” crushing chest pain before seeking help.
How Doctors Check Whether the Pain Is From the Heart
The ECG can provide an early clue
Doctors consider the pattern of pain, accompanying symptoms, medical history and heart risk factors.
An ECG is often one of the first urgent tests. It records the heart’s electrical activity and may show changes caused by reduced blood flow or a heart attack.
Blood tests such as cardiac troponin, repeated ECGs and additional cardiac investigations may also be required.
An ECG is quick and painless, but one normal ECG may not always settle the question if the symptoms are suspicious. Doctors may repeat the ECG and check cardiac troponin, a blood marker that can rise when heart muscle is injured. Depending on the findings, an echocardiogram, coronary angiogram or other tests may be advised by the cardiac team.
At the same time, the medical team may assess abdominal causes such as gallstones, gastritis, ulcers or pancreatitis. Examination, blood tests and abdominal imaging may be needed depending on the pain pattern. The goal is not to assume that every upper abdominal pain is cardiac; it is to make sure a dangerous cardiac cause is not missed while the actual source of pain is identified.
This is why an online symptom checklist cannot replace an emergency evaluation. Two people can use the same words—such as “burning,” “gas” or “stomach pressure”—while having completely different medical conditions.
For more information about common digestive causes, read 12 common causes of abdominal pain, why acidity keeps returning, and why gallstones develop.
Watch Dr. Kiran KJ Explain This Important Case
In this short video, Dr. Kiran KJ explains how upper abdominal pain, along with subtle chest and left-arm symptoms, led to the timely diagnosis of a heart attack.
Frequently Asked Questions
Can a heart attack feel only like stomach pain?
It can, although chest pain or discomfort remains the most common symptom. Some people—particularly women, older adults and people with diabetes—may have less typical symptoms such as upper abdominal discomfort, nausea, breathlessness, sweating, fatigue or dizziness.
How can I know whether it is gas, acidity or a heart attack?
You may not be able to distinguish them safely at home because symptoms overlap. New, severe or unexplained discomfort—especially with chest or arm pain, sweating, breathlessness, nausea or dizziness—requires emergency assessment.
Will taking an antacid confirm that the pain is acidity?
No. Symptoms changing after an antacid cannot reliably rule out a heart problem. Do not use response to a home remedy as a diagnostic test when warning signs are present.
Is left-arm pain always present during a heart attack?
No. Pain may affect either arm or may spread to the shoulder, back, neck, jaw or upper abdomen. Some people have no radiating pain at all.
One Decision Can Save a Life
Most stomach pain is not a heart attack. But the cost of overlooking the rare cardiac case can be very high. If upper abdominal pain is severe, unusual or accompanied by chest discomfort, sweating, breathlessness, nausea, dizziness or spreading pain, seek emergency help immediately.
Please share this article with your family and friends. Recognising this uncommon warning sign—and acting quickly—may help save a life.
Medical disclaimer: This article is for public awareness and does not replace an examination, diagnosis or treatment by a qualified healthcare professional. If you suspect a heart attack, seek emergency medical care immediately.